Coffee filter



FIG. 1 is a top plan view of the coffee filter showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a right side plan view thereof, the other side plan views being the same as the right side plan view; and,

FIG. 4 is a sectional view taken along line 4-4 of FIG. 3.

The broken lines in the drawings illustrate environmental material that forms no part of the claimed design. 

CLAIM The ornamental design for a coffee filter, as shown and described. 